Wall Street down as China currency move stokes growth fears

U.S. stocks fell in morning trading on Tuesday in a broad retreat, with the Dow down more than 1 percent, as China's surprise devaluation of the yuan pushed the dollar higher and pressured commodity-related stocks. The yuan fell to its lowest against the dollar in almost three years following what China's central bank described as a "one-off depreciation" that increased unease about the health of the country.